Why do controls feel sluggish during Titanfall mech dives?

The moment the mech dove, the frame time jumped from a stable 9ms to 55ms per RivaTuner, making the controls feel incredibly sluggish. I first tried disabling the GPU lighting controller in Device Manager; while frame times stabilized, the RGB lights went dark. I used the GamePP Peripheral Driver Conflict Detector to set the lighting sync service to manual and set the game to Realtime priority. The RivaTuner frame time curve converged from 9-55ms to 8-13ms, and GPU temps stayed at 62-67℃ per HWInfo64.